Polyamide 6/clay nanocomposites

Polymer clay nanocomposites exhibit very low flammability. For instance, the heat release rate during the combustion of polyamide 6-clay nanocomposite is reduced by 63% with a clay content of 5wt%. The nanocomposite structure also enhances the property of the char through reinforcement of the... 

S-H. Wu, F-Y. Wang, C-C.M. Ma, W-C. Chang, C-T. Kuo, H-C. Kuan, and W-J. Chen, Mechanical, thermal and morphological properties of glass fiber and carbon fiber reinforced polyamide-6 and polyamide-6/clay nanocomposites, Mater. Lett., 49, 327-333 (2001). 

Winberg, R, Eldrup, M., Jprgen Pedersen, N., van Es, M. A., and Maurer, F. H. J., Free volume sizes in intercalated polyamide 6/clay nanocomposites. Polymer, 46, 8239-8249... 

Gonzalez, L, Eguiazabal, J. L, and Nazabal, J. 2005. Compatibilization level effects on the structure and mechanical properties of rubber-modified polyamide-6/clay nanocomposites. Journal of Polymer Science Part B-Polymer Physics 43 3611-3620. 

D. Garcia-Lopez, I. Gobernado-Mitre, J. F. Fernandez, J. C. Merino, and J. M. Pastor, Properties of polyamide 6/clay nanocomposites processed by low cost bentonite and different organic modifiers. Polymer Bulletin, 62 (2009), 791-800. 

Dabrowski, F. Le Bras, M. Cartier, L. Bourbigot, S. The use of clay in an EVA-based intumescent formulation comparison with the intumescent formulation using polyamide-6 clay nanocomposite as carbonisation agent. J. Fire Sci. 2001, 19(3), 219-241. 

TABLE 11.3 Tabulated and Calculated PHRR Results for Polyamide-6/Clay Nanocomposites... 

Jang, B.N. Wilkie, C.A. The effect of clay on the thermal degradation of polyamide 6 in polyamide 6/clay nanocomposites. Polymer 2005, 46, 3264-3274. 

Bureau M N, Denault J, Cole K C and Enright G D (2002) The role of crystallinity and reinforcement in the mechanical behavior of polyamide-6/clay nanocomposites, Polym Eng Sd 42 1897-1906. 

Kim et al [102,103] reported that the toughness of polyamide 12/clay and polyamide 6/clay nanocomposites was enhanced due to the occurrence of some energy dissipating events. They performed in situ tensile tests on thin films of these nanocomposites hi a transmission electron microscope and observed that the major deformation process in these materials was micro-void formation inside the stacked silicate layers. Since the clay interlayer strength is weaker than the clay/matrix interfacial strength, delamination or interlayer debonding... 

In the present work, the micromechanics-based model presented by Anoukou et al. [7,8] is applied to formulate the effective viscoelastic response of polyamide-6/clay nanocomposites, experimentally tested in a previous work [6]. 

Nanocomposites based on polymer-clay systems are of considerable interest for the development of new stmctural and functional materials. Recently, there has been much research into polymer/day nanocomposites such as epoxy, acrylic,polystyrene, and polyamide-6, owing to their unique and improved properties. For instance, compared to polyamide-6, polyamide-6/clay nanocomposites at 5wt.% day loading levd had the heat distortion temperature 87 °C higher. Also the tensile strength and tensile modulus were 49% and 68% higher, while the impact strength was almost unchanged. ... 

Feng M, Gong F, Zhao C, Chen G, Zhang S, Yang M, et al. The P-crystaUine form of isotactic polypropylene in blends of isotactic polypropylene and polyamide-6/clay nanocomposites. J Polym Sci B Polym Phys 2004 42(18) 3428-38. 

Giza, E., Ito, H., Kikutani, T., Okui, N. (2000b), Stractural control of polyamide 6/clay nanocomposite fibers by in-line drawing process , J Polym Eng, 20 (6), 403-425. 

Pramoda, K.P., Liu, T. Effect of moisture on the dynamic mechanical relaxation of polyamide-6/clay nanocomposites. J. Polym. Sci. Part B Polym. Phys. 42, 1823 (2004)... 

Kashiwagi T (2004), Flame retardant mechanism of polyamide 6-clay nanocomposites . Polymer 45 881-891. 

The moisture diffusion in Polyamide 6/clay nanocomposites, containing 2 wt.% of clay, has been studied by Low et al. The Authors found that the diffusion coefficient shows an U-shape dependence, while the solubility coefficient monotonically decreases as the relative humidity (RH) increases. The maximum value of the diffusion coefficient was attributed to the onset of water clustering in the polyamide, whereas the decrease of the diffusion coefficient was attributed to... 

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